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Commit ec7af972 authored by Ilya Dryomov's avatar Ilya Dryomov Committed by Sage Weil
Browse files

libceph: introduce get_osdmap_client_data_v() 



Full and incremental osdmaps are structured identically and have
identical headers.  Add a helper to decode both "old" (16-bit version,
v6) and "new" (8-bit struct_v+struct_compat+struct_len, v7) osdmap
enconding headers and switch to it.

Signed-off-by: default avatarIlya Dryomov <ilya.dryomov@inktank.com>
Reviewed-by: default avatarAlex Elder <elder@linaro.org>
parent 10db634e

net/ceph/osdmap.c

+65 −16
Original line number Diff line number Diff line
@@ -683,6 +683,63 @@ static int osdmap_set_max_osd(struct ceph_osdmap *map, int max) 
	return 0;

}



#define OSDMAP_WRAPPER_COMPAT_VER	7

#define OSDMAP_CLIENT_DATA_COMPAT_VER	1



/*

 * Return 0 or error.  On success, *v is set to 0 for old (v6) osdmaps,

 * to struct_v of the client_data section for new (v7 and above)

 * osdmaps.

 */

static int get_osdmap_client_data_v(void **p, void *end,

				    const char *prefix, u8 *v)

{

	u8 struct_v;



	ceph_decode_8_safe(p, end, struct_v, e_inval);

	if (struct_v >= 7) {

		u8 struct_compat;



		ceph_decode_8_safe(p, end, struct_compat, e_inval);

		if (struct_compat > OSDMAP_WRAPPER_COMPAT_VER) {

			pr_warning("got v %d cv %d > %d of %s ceph_osdmap\n",

				   struct_v, struct_compat,

				   OSDMAP_WRAPPER_COMPAT_VER, prefix);

			return -EINVAL;

		}

		*p += 4; /* ignore wrapper struct_len */



		ceph_decode_8_safe(p, end, struct_v, e_inval);

		ceph_decode_8_safe(p, end, struct_compat, e_inval);

		if (struct_compat > OSDMAP_CLIENT_DATA_COMPAT_VER) {

			pr_warning("got v %d cv %d > %d of %s ceph_osdmap client data\n",

				   struct_v, struct_compat,

				   OSDMAP_CLIENT_DATA_COMPAT_VER, prefix);

			return -EINVAL;

		}

		*p += 4; /* ignore client data struct_len */

	} else {

		u16 version;



		*p -= 1;

		ceph_decode_16_safe(p, end, version, e_inval);

		if (version < 6) {

			pr_warning("got v %d < 6 of %s ceph_osdmap\n", version,

				   prefix);

			return -EINVAL;

		}



		/* old osdmap enconding */

		struct_v = 0;

	}



	*v = struct_v;

	return 0;



e_inval:

	return -EINVAL;

}



static int __decode_pools(void **p, void *end, struct ceph_osdmap *map,

			  bool incremental)

{
@@ -798,7 +855,7 @@ static int decode_new_pg_temp(void **p, void *end, struct ceph_osdmap *map) 
 */

static int osdmap_decode(void **p, void *end, struct ceph_osdmap *map)

{

	u16 version;

	u8 struct_v;

	u32 epoch = 0;

	void *start = *p;

	u32 max;
@@ -807,15 +864,9 @@ static int osdmap_decode(void **p, void *end, struct ceph_osdmap *map) 


	dout("%s %p to %p len %d\n", __func__, *p, end, (int)(end - *p));



	ceph_decode_16_safe(p, end, version, e_inval);

	if (version > 6) {

		pr_warning("got unknown v %d > 6 of osdmap\n", version);

		goto e_inval;

	}

	if (version < 6) {

		pr_warning("got old v %d < 6 of osdmap\n", version);

		goto e_inval;

	}

	err = get_osdmap_client_data_v(p, end, "full", &struct_v);

	if (err)

		goto bad;



	/* fsid, epoch, created, modified */

	ceph_decode_need(p, end, sizeof(map->fsid) + sizeof(u32) +
@@ -943,15 +994,13 @@ struct ceph_osdmap *osdmap_apply_incremental(void **p, void *end, 
	__s32 new_flags, max;

	void *start = *p;

	int err;

	u16 version;

	u8 struct_v;



	dout("%s %p to %p len %d\n", __func__, *p, end, (int)(end - *p));



	ceph_decode_16_safe(p, end, version, e_inval);

	if (version != 6) {

		pr_warning("got unknown v %d != 6 of inc osdmap\n", version);

		goto e_inval;

	}

	err = get_osdmap_client_data_v(p, end, "inc", &struct_v);

	if (err)

		goto bad;



	/* fsid, epoch, modified, new_pool_max, new_flags */

	ceph_decode_need(p, end, sizeof(fsid) + sizeof(u32) + sizeof(modified) +